Work

Carrier dynamics and degradation behavior in exciplex upconversion-type organic light-emitting diodes

Year: 2025

Type: article

Abstract: Organic light-emitting diodes (OLEDs) have attracted considerable attention for display and lighting applications. However, improving device stability and operational lifetime remains a major issue. In this study, exciplex upconversion-type OLEDs (ExUC-OLEDs) utilizing a donor/acceptor interface were investigated to achieve low-voltage operation and enhanced device stability. Compared with conventional OLEDs, the ExUC-OLED exhibited superior voltage stability and a 35 times longer operational lifetime. Displacement current measurements confirmed that charge accumulation was effectively suppressed even after long-term operation and ideal carrier recombination at the interface was achieved. Analysis focusing on carrier dynamics provides new insights into the degradation processes of OLEDs.

Source: Japanese Journal of Applied Physics

DOI: 10.35848/1347-4065/ae0133

Authors: Hikaru Nagahama, Masahiro Morimoto, Shigeki Naka

Institution: University of Toyama

Language: English

Topic: Organic Light-Emitting Diodes Research

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

Open Access status: hybrid

Estimated APC paid: $2,210

Funders: Kato Foundation for Promotion of Science, Japan Society for the Promotion of Science